The daughter of designer Oleg Cassini and Hollywood legend Gene Tierney says she is closer to collecting on a promise, thanks to a Long Island judge’s ruling this month.

Christina Cassini, 61, sued in 2007 to get 25 percent of the designer’s $50 million estate.

Marianne Nestor Cassini, the designer’s third wife, was left the bulk of the estate, and runs Oleg Cassini Inc. She moved to block the suit, but Nassau County Surrogate Court Judge John B. Riordan denied the motion. He said Cassini promised in his 1952 divorce from Tierney that he would write a will leaving both of his daughters half of his fortune.